Beater for paper stock



Sept. 13, 1938. c. R. SEAB ORNE BEATER FOR PAPER STOCK Filed April 5, 1936 2 Sheets-Sheet l aw-[e5]? fiea orne p 1938. c. R. SEABORNE 2,129,789

BEATER FOR PAPER STOCK Filed April 3, 1936 2. Sheets-Sheet 2 Patented Sept. 13, 1938 2,129,789

UNITED STATES PATENT OFFICE BEATER $131221: STOCK Applicatiorliozl'ilii )No. 12,509

My invention relates to beaters for paper stock with a plurality of downwardly projecting beater and is concerned primarily with the improvement knives 9 at the bottom surface thereof. of beaters of the general type disclosed in my The bottom of the bowl is normally closed by Patent No. 1,691,308, which was issued on Novema rotatable disk or plate Ii having a plurality of her 13, 1928. beater knives i2 for cooperating with the beater 5 The principal objects of the present invention knives 9 of the bowl operatively supported upon are to provide a beater of this general type which the upper surface thereof. The plate I I is supshall be capable of sustained operation without ported for rotatable movement beneath the bowl clogging of the beater knives over long periods I by means of a vertically extending shaft i3 10 of time; to provide a beater of this type wherein and a thrust bearing H, a suitable hub l5 cast in- 10 the circulation of pulp shall be effected with a tegrally with the plate ii being keyed to the shaft greater positiveness and at a more rapid rate IS. The plate ii is provided with at least one than has been heretofore accomplished; to imimpeller blade l6 cast integrally with the upper prove generally beaters of this type; and to prosurface thereof for aiding in effecting the circuvide a simple means readily attachable to existlation of the pulp through the beater knives. If 15 ing beaters for preventing clogging thereof durdesired, peripherally arranged vanes as are indiing use. Other objects and uses of the invention cated at I6 may be used for further increasing will be made apparent by reference to the followthe speed and effectiveness of the pulp circulaing specification and the drawings, whereintion. I

Fig. 1 is a sectional view, partially in eleva- During operation of the beater, the pulp or 20 tion, of a beater embodying the features of my other stock, the normal level of which is indiinvention. The view is taken on the general line cated by the dot and dash line H, is circulated l--l of Fig. 2; within the bowl 8 and the outer closure i in the Fig. 2 is a bottom plan view of the beater il- 'manner indicated by the arrows. In order to 2 lustrated in Fig. 1; aid in securing vertical movement of the pulp Fig. 3 is an inverted, detail plan view showing within the bowl and hence more positive circuthe bottom of the bowl and the beater knives lation of the pulp between the cooperating sets positioned thereon; of beater knives, I have provided a feeder screw Fig.4 is afragmentary view'showing the motor i8 which is supportedupon and keyed to the operated mechanism for raising and lowering the shaft l3. This feeder screw is preferably of hol- 3o beater bowl; low, cast metallic construction as illustrated in Fig. 5 is a perspective view showing one of the drawings, but other arrangements are, of the scraper knives used in accomplishing the course, satisfactory. objects of my invention, and For rotating the plate II which closes the bot- Figs. 6 and '7 are fragmentary views illustrattom of the bowl 8, and the feeder screw I8, I 35 ing the manner in which the scraper knives prefer to utilize an electric motor indicated at l9, shown in detail in Fig. 5 are mounted upon the in conjunction with a suitable speed changing beater structure. I mechanism indicated at 20, this mechanism be- Referring to the drawings, my improved beater ing mechanically coupled with the upper end of 40 includes a generally cylindrically shaped outer the shaft by any suitable means. The motor and 40 tank or closure I which is supported upon a suitthe speed changing mechanism are supported able frame 2, which may comprise welded strucupon a suitable frame on superstructure 38 at the tural sections, as is illustrated in Figs. 1 and 2. top of the beater.

The bottom of the outer closure i is permanently For most satisfactory operation of a heater of closed by means such as the metallic plate 3, this type, it is desirable that the cooperating sets 45 and the top is likewise closed by a similar plate of beater knives shall be vertically adjustable I having a suitable opening 5 through which with respect to each other. In the device illuspulp stock may be introduced into the beater. trated in the drawings this adjustment is made The beater structure also includes a pressure oppossible by the provision of a vertically adjustaerated dump valve 6 for withdrawing the pulp at ble support means for the bowl 8. This support 5 the conclusion of the beating operation and a means comprises three symmetrically positioned water inlet pipe I. mechanisms 2i, each of which includes a thrust An annularly shaped, cast metallic bowl 8 rod 24 adapted to be aflixed to the bottom of the which is open at its top and bottom is positioned bowl 8, and an adjustable lift screw 22 for raising 66 within the outer tank or closure i and isprovided and lowering the thrust rod. The lift screws 22 are each actuated by a sprocket wheel 2;, and in order that vertical adjustment of the bowl can be most conveniently carried out, the sprocket wheels 23 are interconnected by a chain 25 which also engages the sprocket drive wheel 26 of the motor operated bowl raising and lowering mechanism 21, illustrated particularly in Figs. 1 and 4. The motor drive of this mechanism 21 preferably ,includes a speed reducing gearing indicated at 28, this arrangement permitting very close vertical adjustment of the cooperating sets of beater knives 9 and I2. The

bowl supporting mechanism 2| includes yieldable' means intermediate the thrust rods 24 and the lift screws 22 which permits momentary upward movement of the bowl to prevent damage to the stock. This clogging occurs as the stock flows,

outwardly through the knives, some of it having a tendency to staple or jackknife in the space between the stationary and rotating blades. While this clogging in no sense renders the beater inoperative, it substantially impairs its efliciency,

particularly when a feeder screw is utilized, the clogging then preventing the full realization of the increased speed of circulation possible with such a structure.

I have found that this clogging can be completely obviated by the provision of one or more of the scraper knives 30, illustrated particularly in Figs. 1, 2, 5, and 7. Preferably a plurality of these knives 30 are supported at spaced intervals upon the inner surface of the bowl 8, the leading edge of the knife portion 3| thereof pointing in a direction opposite to the normal direction of the rotation of the plate II. The scraper knives 30 are positioned immediately in front of the cooperating beater knives 9 and I2, the resulting scraping action, particularly when aided by the shearing efiect of the vane It, produces a substantially continuous cleaning of the space immediately in front of the cooperating beater knives 9 and I2.

The scraper knives 30 are preferably adjustable to at least a slight degree in order that the most eiiicient scraping action may be effected. Adjustment of the specific form of scraper knives illustrated in the drawings is made possible through the provision of slotted openings 32 for the shanks of the cap screws 33 utilized in affixing the scraper knives to the bowl proper.

From the foregoing it will be seen that I have provided a new and improved form of beater which possesses numerous advantages over the constructions heretofore known to the art. My improved beater includes means for continuously scraping accumulations of pulp from in front of the cooperating beater knives and thus makes possible a substantial increase in the speed of operation of the beater. Further, I have shown how this continuous scraping action may be utilized in conjunction with high speed feeder screws or the like for accomplishing very much more rapid beating of the pulp than has been heretofore possible. I have also disclosed a simple type of scraper knife which may be convenientlnapplied to existing beater structures for improvirig the operation thereof.

Various modifications may be made in the parknives for cooperating with the beater knives of the bowl, and at least one scraper knife supported upon said bowl adjacent said rotary plate for preventing clogging of said knives during use of said machine.

2. A machine of the character described comprising a bowl open at its top and bottom and having its bottom provided with a plurality of beater knives, the cutting edges of which extend in a generally horizontal direction, a rotatable plate extending beneath and closing the bottom of said bowl, said plate having a plurality of beater knives, the cutting edges of which likewise extend in a generally horizontal direction for cooperating with the knives of the bowl, and

means for preventing clogging of said knives dur ing the use of said machine comprising at least one generally vertical scraper knife supported upon said bowl adjacent said cooperating beater knives.

3. A machine of the character described comprising a bowl open at its top and bottom and having its bottom provided with beater knives, a rotatable plate extending beneath and closing the bottom of said bowl, said plate having beater knives for cooperating with the beater knives of the bowl, and means for preventing the stock from stapling or jackknifing as it flows through and between said cooperating knives, said means comprising a plurality of scrapers adjustably mounted upon said bowl.

4. A machine of the character described comprising a bowl openat its top and bottom and having its bottom provided with beater knives, a rotatable plate extending beneath and. closing the bottom of said bowl, said plate having knives for cooperating with the knives of said bowl, a feeder screw disposed within said bowl for circulating the pulp in a vertical direction therein, means for rotating said feeder means and said plate during the operation of said machine, and means for preventing clogging of said heater knives during the operation of said machine, said last mentioned means comprising at least one stationary scraper knife supported inside said bowl adjacent said cooperating beater knives.

.5. A machine of the character described comprising a bowl open at its top and bottom and having its bottom provided with beater knives, a rotatable plate extending beneath and closing the bottom of said bowl, said plate having beater knives for cooperating with the beater knives of said bowl, a feeder screw arranged for rotation within said bowl for circulating the pulp in a vertical direction within said bowl, a receptacle for pulp surrounding said knives communicating with the top of said bowl, means for simultaneously rotating said rotatable plate and said feeder screw, and means for preventing clogging of said heater knives comprising a plurality of spaced stationary scraper knives adjustably supported upon the inner surface of said bowl adjacent said cooperating beater knives.

6. A machine of the character described, comprising a bowl open at its top and bottom and having its bottom provided with beater knives, a plate extending beneath and closing the bottom of said bowl, said plate being provided with beater knivesfor cooperating with the beater knives of said bowl, means for imparting rotation to one set of said knives and the part carrying the same, and means comprising at least one scraper knife supported upon said bowl adjacent the area of entry of the stock between said cooperating beaterknives for preventing the clogging thereof during use of said machine.

-7. A machine of the character described, comprising a bowl open at its top and bottom and having its bottom provided with a set of beater knives, a plate extending beneath and closing the bottom of said bowl, said plate being provided with a second set of beater knives for cooperating with the beater knives of said bowl, means for imparting rotation to one set of beater knives and the part carrying the same, a feeder screw positioned within said bowl for forcing the stock to circulate in a vertical direction, and at least one scraper knife supported upon said bowl adjacent said cooperating beater knives for preventing the clogging thereof during use of said machine.

8. A machine of the character described, comprising a bowl open at its top and bottom and having its bottom provided with beater knives, a rotatable plate extending beneath and closing the bottom of said bowl, said Plate being provided with beater knives for cooperating with the beater knives of said bowl and with at least one impeller blade arranged to move within said bowl, means for rotating said plate, and at least one 2 supported upon said bowl adjacent said cooperating beater knives, said impeller blade and said scraper knife cooperating to aid in preventing clogging of said knives during use of said machine. l

9. A machine of the character described, comprising a bowl open at its top and bottom and having its bottom provided with a set of beater knives, a rotatable shaft located centrally within said bowl, a feeder screw supported upon said shaft within said bowl, a plate provided with a set of beater knives for cooperating with the beater knives of said bowl also supported on said shaft, said plate extending beneath and closing the bottom of said bowl, means for rotating said shaft, and at least one, scraper knife supported upon said bowl adjacent said cooperating beater knives for preventing the cloggin thereof during the use of said machine.

10. A machine of the character described, comprising a tank, a bowl disposed within said tank so as to be spaced some distance from the walls thereof, said bowl being open at its top and bottom and having its bottom provided with beater knives, a rotatable plate extending beneath and closing the bottom of said bowl, said plate being provided with beater knives for cooperating with the knives of said bowl and having upon its upper surface at least one impeller blade, a feeder screw located within said bowl substantially copeller blade and said scraper knife cooperating to aid in preventing the clogging of said heater knives w :w the use of said machine. 

